Seeing a likely 3-way flop against two big stacked unknowns with TT sounds good to me FR. 3betting has its perks but UTG+1's minraise could mean anything, i'd rather not waste the value TT has by bombing that raise right away, since it's hard to play correctly on flops with overcards against an unknown if he calls, and we might even get 4bet off our hand which would suck.

Postflop is fine if you figure he's drawing. Sometimes he'll have Ax too when he checks the turn, since people blockbetting with draws tend to do it again on the next street. Both betting the turn / check behind river and check behind turn / call a blank river are good lines there.